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Abstract

We demonstrate excitation of whispering gallery modes in optical ring resonators using a gold-clad pedestal planar waveguide structure. The gold-clad structure provides a strong evanescent field for light-coupling into the resonator while enabling low transmission loss throughout much of the visible and near-infrared region. This is advantageous compared to the previously demonstrated anti-resonant reflecting optical waveguide (ARROW) structure, which can only transmit a narrow wavelength band. We show that the height of the pedestal waveguide can be designed to optimize the coupling conditions for the ring resonator. This technology enhances the practicality of optical ring resonators for sensing devices, laser systems, and many other important applications.

Figures (6)

Fig. 1. (A). Cross-section of waveguide chip structure. (B) Ring resonator in contact with waveguide for WGM excitation. (C) Propagation of light along the waveguide, as it reflects off of the gold layer.

Fig. 5. (A). WGMs in a cylindrical resonator of 140 μm in diameter for 690 nm and 1550 nm that are excited by a gold-clad waveguide of 2.5 μm in height. (B) WGMs in a microsphere of 180 μm in diameter for 690 nm, 980 nm, and 1550